Method for deposition of a catalyst
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United States of America Patent
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Jan 25, 2005
Grant Date -
Feb 26, 2004
app pub date -
May 27, 2003
filing date -
Dec 1, 2000
priority date (Note) -
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Abstract
The invention relates to a method for deposition of a catalyst, in particular a method for coating a membrane electrode unit (MEA) for a fuel cell. Said method requires no external electrical field as usual for conventional galvanic techniques. The support for the catalytic layer is first capacitively charged (pseudocapacitance). When brought into contact with an electrolyte solution, comprising the catalyst in the form of dissolved metal salt ions, an in-situ reduction (deposition) of the metal salt ions to give metallic catalyst occurs at the site of contact.
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